title: Effect of crown to implant ratio and implant dimensions on periimplant stress of splinted implant-supported crowns: a finite element analysis.
abstract: OBJECTIVE
  To assess the influence of different crown-implant (C/I) ratios and implant dimensions on periimplant stress in the partially edentulous posterior mandible by 3-dimensional finite element analysis (FEA).
  
  
  METHODS
  Two implants were placed in the second premolar and first molar regions of the mandibular model. The implants were then splinted with a 2-unit fixed bridge. The influence of 3 parameters (C/I ratio, implant length, and implant diameter) on periimplant bone stress was then analyzed by using FEA.
  
  
  RESULTS
  C/I ratios showed a direct relationship with periimplant bone stress, but the absolute height of the clinical crown had a much more significant influence. The implant length had less influence on the periimplant bone stress than the implant diameter. Lower stress values were detected in wide-diameter implants, even in scenarios involving long crowns.
  
  
  CONCLUSIONS
  Crown height is a more important factor affecting the periimplant bone stress than the C/I ratio for splinted implant-supported crowns. Two-unit fixed restorations with high C/I ratios may be successfully used with wide-diameter implants in the posterior mandible.
authors.affiliation: Department of Oral Implantology, Istanbul University, Istanbul, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Bayraktar
authors.forename: B Alper
authors.initials: BA
authors.lastname: Gultekin
authors.forename: Serdar
authors.initials: S
authors.lastname: Yalcin
authors.forename: Eitan
authors.initials: E
authors.lastname: Mijiritsky
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001641:Bicuspid; D001696:Biomechanical Phenomena; D002858:Chromium Alloys / Q000737:chemistry; D003198:Computer Simulation; D003442:Crowns; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003830:Denture, Partial, Fixed; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D007576:Jaw, Edentulous, Partially / Q000503:physiopathology; D008334:Mandible / Q000503:physiopathology; D008954:Models, Biological; D008963:Molar; D017680:Potassium Compounds / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D002858:Chromium Alloys; D015921:Dental Implants; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar